136859561 has 2 divisors, whose sum is σ = 136859562. Its totient is φ = 136859560.

The previous prime is 136859557. The next prime is 136859573. The reversal of 136859561 is 165958631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102414400 + 34445161 = 10120^2 + 5869^2 .

It is an emirp because it is prime and its reverse (165958631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136859561 - 2² = 136859557 is a prime.

It is a super-2 number, since 2×136859561² = 37461078874225442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136859551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68429780 + 68429781.

It is an arithmetic number, because the mean of its divisors is an integer number (68429781).

Almost surely, 2^136859561 is an apocalyptic number.

It is an amenable number.

136859561 is a deficient number, since it is larger than the sum of its proper divisors (1).

136859561 is an equidigital number, since it uses as much as digits as its factorization.

136859561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 44.

The square root of 136859561 is about 11698.6991157137. The cubic root of 136859561 is about 515.3374619237.

The spelling of 136859561 in words is "one hundred thirty-six million, eight hundred fifty-nine thousand, five hundred sixty-one".